>To back up your claim of jazz being "European", please source a European that composed with blues scale, jazz chords, and swing before African Americans.
Those jazz chords are descended and altered from traditional european harmony though, themselves, not sole descendants some African musical tradition (which didn't use such harmonies).
As were the instruments themselves (trumpets, trombones, saxophones, pianos, etc.)
Jazz was a mix of African-American vocal music and musical idioms (with a US-localized trhough over African origin) with european harmony, marching band music, and other forms.
Those jazz chords are descended and altered from traditional european harmony though, themselves, not sole descendants some African musical tradition (which didn't use such harmonies).
As were the instruments themselves (trumpets, trombones, saxophones, pianos, etc.)
Jazz was a mix of African-American vocal music and musical idioms (with a US-localized trhough over African origin) with european harmony, marching band music, and other forms.